The story behind the research into the cause of tooth cavities. Who would have thought that the search for a perfect smile could have such a sinister background? 

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Promos: Assassinations Podcast and ISGD! A True Crime Podcast 

Image: By Anup Shah. Attribution-ShareAlike 2.0 Generic (CC BY-SA 2.0)

https://www.flickr.com/photos/anupshah/15748799847/in/album-72157649172406178/